import './waves.css'

import { Directive, DirectiveBinding } from 'vue'
interface ElType extends HTMLElement {
  '@@wavesContext'?: any
}

const context = '@@wavesContext'

function handleClick( el: ElType, binding: DirectiveBinding ) {
  function handle( e: MouseEvent ) {
    const customOpts = Object.assign( {}, binding.value )
    const opts = Object.assign(
      {
        ele : el, // 波纹作用元素
        type : 'hit', // hit 点击位置扩散 center中心点扩展
        color : 'rgba(0, 0, 0, 0.15)' // 波纹颜色
      },
      customOpts
    )
    const target = opts.ele
    if ( target ) {
      target.style.position = 'relative'
      target.style.overflow = 'hidden'
      const rect = target.getBoundingClientRect()
      let ripple = target.querySelector( '.waves-ripple' )
      if ( !ripple ) {
        ripple = document.createElement( 'span' )
        ripple.className = 'waves-ripple'
        ripple.style.height = ripple.style.width = Math.max( rect.width, rect.height ) + 'px'
        target.appendChild( ripple )
      } else {
        ripple.className = 'waves-ripple'
      }
      switch ( opts.type ) {
        case 'center':
          ripple.style.top = rect.height / 2 - ripple.offsetHeight / 2 + 'px'
          ripple.style.left = rect.width / 2 - ripple.offsetWidth / 2 + 'px'
          break
        default:
          ripple.style.top =
            ( e.pageY - rect.top - ripple.offsetHeight / 2 - document.documentElement.scrollTop ||
              document.body.scrollTop ) + 'px'
          ripple.style.left =
            ( e.pageX - rect.left - ripple.offsetWidth / 2 - document.documentElement.scrollLeft ||
              document.body.scrollLeft ) + 'px'
      }
      ripple.style.backgroundColor = opts.color
      ripple.className = 'waves-ripple z-active'
      return false
    }
  }

  if ( !el[context] ) {
    el[context] = {
      removeHandle : handle
    }
  } else {
    el[context].removeHandle = handle
  }

  return handle
}

const wave: Directive = {
  beforeMount( el: ElType, binding: DirectiveBinding ) {
    el.addEventListener( 'click', handleClick( el, binding ), false )
  },
  beforeUpdate( el: ElType, binding: DirectiveBinding ) {
    el.removeEventListener( 'click', el[context].removeHandle, false )
    el.addEventListener( 'click', handleClick( el, binding ), false )
  },
  unmounted( el: ElType ) {
    el.removeEventListener( 'click', el[context].removeHandle, false )
    el[context] = null
    delete el[context]
  }
}

export default wave
